Esp8266 Serial Wifi Wireless Transceiver

Description:The least expensive micro controller to WIFI transceiver

Specifications: This is a wifi solution based on IC ESP8266 from Espressif, price competitive with great functionality. Bring your project to the internet of things easily!

Features:

• Very competitive price
• AP, STA, AP+STA modes available.
• Very simple AT commands, easy to use.
• internal LWIP interface.
• Only four pins interface, VCC-3V3, GND, TXD and RXD.

Note:
There is a growing community for this awesome little transceiver. Instructables has a few interesting builds, and a quick google search will find all sorts of ways to experiment with it.